added eqvt-lemma for split; changed semantics of perm_simp: excluded stands for constants about which no complaint is written out...eqvt_apply is now always applied

no_document use_thys
   ["Nominal2_Base",
    "Nominal2_Eqvt",
    "Nominal2_Atoms",
    "Nominal2_Supp",
    "Atoms"];